If you go to
www.usmilitary.about.com and search for "dlab" and "language categories" it should bring up a page for the DLAB and what scores you need for the different categories of languages if you want to read further on it. Here is the table they have listed:
85 for a Category I language (Dutch, French, Italian, Portuguese, and Spanish)
90 for a Category II language (German)
95 for a Category III language (Belorussian, Czech, Greek, Hebrew, Persian, Polish, Russian, Serbian/Croatian, Slovak, Tagalog [Filipino], Thai, Turkish, Ukrainian, and Vietnamese)
100 for a Category IV language (Arabic, Chinese, Japanese, and Korean)
They've since revised the listing and added a Cat 5 (and they've lengthened the training, as well) for languages like Chinese and Korean. I think, as far as I know, Arabic may still be a 4. I'm at DLI right now, so if you have any more questions, I could probably find out the correct info, moreso than a website would.